![]() ![]() However this introduced an extra component in the circuit which increases the complexity and decreases the reliability. I suppose your method should work, providing you have sized the capacitor with sufficient storage capacity. Sounds like you have used the capacitor to keep your relay latched 100% of the time. That way, the light runs at full power for 100% of the time. The way most, maybe all, have used the capacitor is to store the excess energy that is generated in the lighting circuit while the light is in the operation of the pulse mode, and then the capacitor discharges this energy when the pulse circuit is in the off mode. If I come up with something I'll post it. I'll look overf the schematic and see what I can possibly do. I imagine the BCM has solid state relays which is what are pulsed when the dash-board sensor detects daylight. The curious thing is that in the passenger side circuit that was working, they went on and off over the course of an hour before they didn't turn on again, not to mention the circuit draws about 300mA now, not 5A. That aside, I was not familiar, before this experience, with the fact that GM pulses 12v from the BCM during DRL operation, that explained the buzzing on the AM radio, which went away at night, and altogether when I added the relay and latching capacitor.Īnyway, I checked only the fuses under the hood, not in the passenger compartment since the owner's manual does not indicate there are fuses for DRLs or the low-beams, they only show fuses for high-beams. ![]() I did a calculation at the time and it worked well as far as providing a current decay sufficient to keep the relay coil latched for about one second before turning the lights off and the voltage for the HIDs were then completely isolated from the wiring coming of the BCM. but you do not state what year your vehicle is. but also may not be identical to your model year. The enclosed pdf wiring diagram may be some help. he will have good input on this as other will too. Many members here have the Xenon Depot kit for years with no issues.Īsk member Rit. So even if you find a salvage BCM, it still will likely mean a trip to the dealer. Also, most modules in the vehicle are VIN specific and require programming by the dealer once replaced in order to work in the vehicle. Visually inspecting them can not always be reliable. You will need a meter to electrically check the condition of the fuse. Not sure how you could "bypass" BCM operation without causing further issues.ĭid you try checking ALL the BCM fuses? I think there are 4 or more of them for different circuits. Quite a few came here with similar problems and issues for their first posting. Probably would have been best to visit here first before trying to install HIDs. Jerry rigging a capacitor and relay may work but is a seat of the pants thing as you found out. they provide the proper capacitors to eliminate the pulsed DRL voltage with no ill effects to the BCM. IF you buy a proper HID kit like form Xenon Depot. Voltage to the relay from the passenger headlight is now also 0, I tested the relay and it still works, I'm guessing it's in the BCM, and I'm not opposed to a simple fix of putting it on the fog light circuit until I can replace it with a salvaged BCM, but maybe it would happen again, or maybe the BCM was damaged by not seeing the correct load on the circuit and then another BCM won't work for long either.not a fix in that case.Īny other bypass or fixes to the BCM would be appreciated. Operated flawlessly for a few months then driving one night, the voltage to the passenger side low beam went on and off for a few times before never coming on again. I dealt with this by installing a relay and putting a capacitor across the switching coil to delay un-switching during DRL pulsating, on the passenger side which was still getting voltage.problem solved. After a couple of weeks I realized there was a flickering issue during the day, and I discovered that the BCM pulsated the voltage, as per specification, to the low beam bulbs for DRL which caused the HID lights to flicker, this apparently killed the driver's side DRL section of the BCM.
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